US20170084587A1

US20170084587A1 - Light-emitting device

Info

Publication number: US20170084587A1
Application number: US15/268,681
Authority: US
Inventors: Cheng-Wei HUNG; Jui-Fu Chang; Chin-Hua Hung; Yu-Feng Lin
Original assignee: Genesis Photonics Inc
Current assignee: Nichia Corp
Priority date: 2015-09-18
Filing date: 2016-09-19
Publication date: 2017-03-23
Anticipated expiration: 2036-09-19
Also published as: US9922963B2; US20180211942A1; US10957674B2; CN106549092A; CN111211206A; US10497681B2; CN111223975A; US20200105725A1

Abstract

A light-emitting device includes a substrate, a light-emitting component, a wavelength conversion component, an adhesive and a reflective layer. The light-emitting component is disposed on the substrate. The wavelength conversion component includes a high-density phosphor layer and a lower-density phosphor layer. The adhesive is formed between the light-emitting device and the high-density phosphor layer. The reflective layer is formed above the substrate and covers a lateral surface of the light-emitting component, a lateral surface of the adhesive and a lateral surface of the wavelength conversion component.

Description

This application claims the benefits of U.S. provisional application Ser. No. 62/220,249, filed Sep. 18, 2015, U.S. provisional application Ser. No. 62/241,729, filed Oct. 14, 2015, and Taiwan application Serial No. 104144809, filed Dec. 31, 2015, the subject matters of which are incorporated herein by reference.

TECHNICAL FIELD

The disclosure relates in general to a light-emitting device, and more particularly to a light-emitting device having a reflective layer.

BACKGROUND

Conventional light-emitting device includes a phosphor glue and a light-emitting component, wherein the phosphor glue covers an upper surface and a lateral surface of the light-emitting component. The high temperature generated by the light-emitting component, when illuminating, will negatively affect the phosphor glue, speed up the deterioration of the phosphor glue and change the light color.
Therefore, it has become a prominent task for the industry to slow the deterioration of the phosphor glue.

SUMMARY

Thus, the disclosure provides a light-emitting device capable of relieving the deterioration of the phosphor glue.
According to one embodiment, a light-emitting device is provided. The light-emitting device includes a substrate, a light-emitting component, a wavelength conversion layer, an adhesive layer and a reflective layer. The light-emitting component is disposed on the substrate. The wavelength conversion layer comprises a high-density phosphor layer and a low-density phosphor layer. The adhesive layer is formed between the light-emitting component and the high-density phosphor layer. The reflective layer is formed above the substrate and covering a lateral surface of the light-emitting component, a lateral surface of the adhesive layer and a lateral surface of the wavelength conversion layer.
The above and other aspects of the invention will become better understood with regard to the following detailed description of the preferred but non-limiting embodiment (s). The following description is made with reference to the accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 illustrates a cross-sectional view of a light-emitting device according to an embodiment of the invention;

FIG. 2 illustrates a cross sectional view of a light-emitting device according to another embodiment of the invention;

FIG. 3 illustrates a cross sectional view of a light-emitting device according to another embodiment of the invention;

FIG. 4 illustrates a cross sectional view of a light-emitting device according to another embodiment of the invention;

FIGS. 5A to 5H illustrate manufacturing processes of the light-emitting device of FIG. 1;

FIGS. 6A to 6C illustrate another manufacturing processes of the light-emitting device of FIG. 1;

FIGS. 7A to 7C illustrate manufacturing processes of the light-emitting device of FIG. 2;

FIGS. 8A to 8C illustrate manufacturing processes of the light-emitting device of FIG. 3; and

FIGS. 9A to 9F illustrate manufacturing processes of the light-emitting device of FIG. 4.

DETAILED DESCRIPTION

FIG. 1 illustrates a cross-sectional view of a light-emitting device 100 according to an embodiment of the invention. The light-emitting device 100 includes a substrate 110, a light-emitting component 120, a wavelength conversion layer 130, an adhesive layer 140 and a reflective layer 150.
The substrate 110 is, for example, a ceramic substrate. In the present embodiment, the substrate 110 includes a base 111, a third electrode 112, a fourth electrode 113, a first pad 114, a second pad 115, a first conductive pillar 116 and a second conductive pillar 117.
The base 111 is made of a material such as silicon-based material. The base 111 has a first surface 111 u and a second surface 111 b opposite to the first surface 111 u. The third electrode 112 and the fourth electrode 113 are formed on the first surface 111 u of the base 111, and the first pad 114 and the second pad 115 are formed on the second surface 111 b of the base 111. The first conductive pillar 116 and the second conductive pillar 117 pass through the base 111, wherein the first conductive pillar 116 connects the third electrode 112 to the first pad 114 for electrically connecting the third electrode 112 to the first pad 114, and the second conductive pillar 117 connects the fourth electrode 113 to the second pad 115 for electrically connecting the fourth electrode 113 to the second pad 115.
The light-emitting device 100 may be disposed on a circuit board (not illustrated), wherein the first pad 114 and the second pad 115 of the substrate 110 are electrically connected to two electrodes (not illustrated) of the circuit board, such that the light-emitting component 120 is electrically connected to the circuit board through the first pad 114 and the second pad 115.
The light-emitting component 120 is disposed on the substrate 110. The light-emitting component 120 includes a first electrode 121 and a second electrode 122, wherein the first electrode 121 and the second electrode 122 are electrically connected to the third electrode 112 and the fourth electrode 113 respectively.
The light-emitting component 120 is, for example, a light-emitting diode. Although not illustrated, the light-emitting component 120 may further comprise a first type semiconductor layer, a second type semiconductor layer and a light emitting layer, wherein the light emitting layer is formed between the first type semiconductor layer and the second type semiconductor layer. The first type semiconductor layer is realized by such as an N-type semiconductor layer, and the second type semiconductor layer is realized by such as an P-type semiconductor layer. Alternatively, the first type semiconductor layer is realized by such as a P-type semiconductor layer, and the second type semiconductor layer is realized by such as an N-type semiconductor layer. The P-type semiconductor is realized by a GaN-based semiconductor doped with trivalent elements such as a gallium nitride based semiconductor layer which is doped with Beryllium (Be), zinc (Zn), manganese (Mn), chromium (Cr), magnesium (Mg), calcium (Ca), etc. The N-type semiconductor is realized by a GaN-based semiconductor doped with doped with silicon (Si), germanium (Ge), tin (Sn), sulfur (S), oxygen (O), titanium (Ti) and or zirconium (Zr), etc. The light emitting layer 122 may be realized by a structure of In_xAl_yGa_1-x-yN (0≦x
0≦y
x+y≦1) or a structure which is doped with Boron (B), phosphorus (P) or arsenic (As). In addition, the light emitting layer 122 may be a single-layered structure or multi-layered structure.
The first electrode 121 may be realized by a single-layered structure or a multi-layered structure which is made of at least one of materials including gold, aluminum, silver, copper, rhodium (Rh), ruthenium (Ru), palladium (Pd), iridium (Ir), platinum (Pt), chromium, tin, nickel, titanium, tungsten (W), chromium alloys, titanium tungsten alloys, nickel alloys, copper silicon alloy, aluminum silicon copper alloy, aluminum silicon alloy, gold tin alloy, but is not limited thereto. The second electrode 122 may be realized by a single-layered structure or a multi-layered structure. The second electrode 122 may be made of a material similar to that of the first electrode 121.
The wavelength conversion layer 130 includes a high-density phosphor layer 131 and a low-density phosphor layer 132. The wavelength conversion layer 130 includes a plurality of phosphor particles, wherein a region whose phosphor particle density is higher is defined as the high-density phosphor layer 131, and a region whose phosphor particle density is lower is defined as the low-density phosphor layer 132. In an embodiment, a ratio of a phosphor particle density of the high-density phosphor layer 131 and a phosphor particle density of the low-density phosphor layer 132 ranges between 1 and 10¹⁵, wherein the range may contain or may not contain 1 and 10¹⁵.
In the present embodiment, the high-density phosphor layer 131 is located between the light-emitting component 120 and the low-density phosphor layer 132. That is, the light emitted from the light-emitting component 120 first passes through the high-density phosphor layer 131, and then is emitted out of the wavelength conversion layer 130 through the low-density phosphor layer 132. Due the design of the high-density phosphor layer 131, the light color of the light-emitting device 100 can be collectively distributed in the chromaticity coordinate. As a result, the yield of the light-emitting device 100 may be increased. The low-density phosphor layer 132 may increase a light mixing probability. In detail, for the light L1 which has not contacted the phosphor particles within the high-density phosphor layer 131 yet, the low-density phosphor layer 132 increases the probability of the light L1 contacting the phosphor particles. In the present embodiment, a thickness T2 of the low-density phosphor layer 132 is larger than a thickness T1 of the high-density phosphor layer 131, and accordingly the light mixing probability of the light L1 of the light-emitting component 120 can be further increased. In an embodiment, a ratio of the thickness T2 and the thickness T1 ranges between 1 and 1000, wherein the range may contain or may not contain 1 and 1000.
The wavelength conversion layer 130 covers the entire upper surface 120 u of the light-emitting component 120. That is, in the present embodiment, the area of the wavelength conversion layer 130 viewed from the top view is larger than the area of the light-emitting component 120 viewed from the top view. In an embodiment, a ratio of the area of the wavelength conversion layer 130 viewed from the top view and the area of the light-emitting component 120 viewed from the top view ranges between 1 and 1.35, however less than 1 or larger than 1.35 is also feasible.
In an embodiment, the wavelength conversion layer 130 may be made of a material including sulfide, Yttrium aluminum garnet (YAG), LuAG, silicate, nitride, oxynitride, fluoride, TAG, KSF, KTF, etc.
The adhesive layer 140 is, for example, a transparent adhesive. The adhesive layer 140 includes a first lateral portion 141 and a heat resistance layer 142. The first lateral portion 141 covers a portion of a lateral surface 120 s of the light-emitting component 120, and another portion or the other portion of the lateral surface 120 s of the light-emitting component 120 is covered by the reflective layer 150. Viewed from the direction of the top view of FIG. 1, the first lateral portion 141 is shaped into a closed ring shape which surrounds the entire lateral surface 120 s of the light-emitting component 120. In another embodiment, the first lateral portion 141 may be shaped into an open ring shape.
As illustrated in an enlargement view of FIG. 1, the heat resistance layer 142 of the adhesive layer 140 is formed between the high-density phosphor layer 131 and the light-emitting component 120, and accordingly it can increase the heat resistance between the light-emitting component 120 and the wavelength conversion layer 130 to slows the degrading speed of the wavelength conversion layer 130. In detail, if the heat generated from the light-emitting component 120 is easily transmitted to the wavelength conversion layer 130, it will speed up the deterioration of the phosphor particles within the wavelength conversion layer 130. In the present embodiment, due to the forming of the heat resistance layer 142, the heat transmitted to the wavelength conversion layer 130 can be decreased, and accordingly it can slow the deterioration of the phosphor particles within the wavelength conversion layer 130. In an embodiment, the thickness of the heat resistance layer 142 may range between 1 and 1000, wherein the range may contain or may not contain 1 and 1000.
The reflective layer 150 is formed above the substrate 110 and covers the lateral surface 120 s of the light-emitting component 120, a lateral surface 141 s of the first lateral portion 141 of the adhesive layer 140 and a lateral surface 130 s of the wavelength conversion layer 130, and accordingly it can advantageously protect the light-emitting component 120 and the wavelength conversion layer 130 from being exposed to be damaged. The reflective layer 150 may reflect the light L1 emitted from the lateral surface 120 s of the light-emitting component 120 to the wavelength conversion layer 130, and accordingly it can increase the luminous efficiency of the light-emitting device 100.
As illustrated in FIG. 1, the reflective layer 150 further covers a lateral surface of the first electrode 121, a lateral surface of the second electrode 122, a lateral surface of the third electrode 112 and a lateral surface of the fourth electrode 113. As a result, it can prevent the first electrode 121, the second electrode 122, the third electrode 112 and the fourth electrode 113 from being exposed and damaged by the environment, such as oxidation, humidity, etc.
There is a first gap G1 between the first electrode 121 and the second electrode 122, and there is a second gap G2 between the third electrode 112 and the fourth electrode 113. The reflective layer 150 includes a filling portion 152, and the first gap G1 and/or the second gap G2 is filled with the filling portion 152.
The reflective layer 150 includes a first reflective portion 151 which surrounds the lateral surface 120 s of the light-emitting component 120. The first reflective portion 151 has a first reflective surface 151 s facing the lateral surface 120 s of the light-emitting component 120 and/or the wavelength conversion layer 130 for reflecting the light L1 emitted from the lateral surface 120 s of the light-emitting component 120 to the wavelength conversion layer 130. In the present embodiment, the first reflective surface 151 s is a convex surface facing the lateral surface 120 s of the light-emitting component 120 and/or the wavelength conversion layer 130. In another embodiment, the first reflective surface 151 s may be a concave surface.
As illustrated in FIG. 1, the convex first reflective surface 151 s connects a lower surface 130 b of the wavelength conversion layer 130 to the lateral surface 120 s of the light-emitting component 120. As a result, it can increase the probability of the light L1 emitted from the light-emitting component 120 contacting the convex surface, such that the light L1 emitted from the light-emitting component 120 almost or completely is reflected by the reflective layer 150 to the wavelength conversion layer 130 and then is emitted out of the light-emitting device 100, and accordingly it can increase the luminous efficiency of the light-emitting device 100.
In an embodiment, the reflective layer 150 has a reflectivity larger than 90%. The reflective layer 150 may be made of a material including Poly phthalic amide (PPA), polyamide (PA), polyethylene terephthalate (PTT), polyethylene terephthalate (PET), polyethylene terephthalate 1,4-cyclohexane dimethylene terephthalate (PCT), epoxy compound (EMC), silicone compound (SMC) or other resin/ceramic material having high reflectivity. In addition, the reflective layer 150 may be a white glue.
As described above, in comparison with the conventional light-emitting device, the luminous area of the light-emitting device 100 can increase by 40% and the brightness of the light-emitting device 100 can increase by 15%.
FIG. 2 illustrates a cross sectional view of a light-emitting device 200 according to another embodiment of the invention. The light-emitting device 200 includes the substrate 110, the light-emitting component 120, the wavelength conversion layer 130, the adhesive layer 140 and the reflective layer 150.
In comparison with the light-emitting device 100, the top-viewed area of the wavelength conversion layer 130 of the light-emitting device 200 is substantially equal to the top-viewed area of the light-emitting component 120 of the light-emitting device 200, that is, the ratio of the top-viewed area of the wavelength conversion layer 130 and the top-viewed area of the light-emitting component 120 is about 1. Due the first lateral portion 141 of the adhesive layer 140 being removed, the entire lateral surface 120 s of the light-emitting component 120 and the entire lateral surface 142 s of the heat resistance layer 142 of the adhesive layer 140 are exposed, and accordingly the entire lateral surface 120 s of the light-emitting component 120 and the entire lateral surface 142 s of the heat resistance layer 142 of the adhesive layer 140 can be covered by the reflective layer 150. Furthermore, since the lateral surface 120 s of the light-emitting component 120, the lateral surface 130 s of the wavelength conversion layer 130 and the lateral surface 142 s of the heat resistance layer 142 of the adhesive layer 140 can be formed in the same singulation process, the lateral surface 120 s, the lateral surface 130 s and the lateral surface 142 s are substantially aligned or flush with each other.
FIG. 3 illustrates a cross sectional view of a light-emitting device 300 according to another embodiment of the invention. The light-emitting device 300 includes the substrate 110, the light-emitting component 120, the wavelength conversion layer 130, the adhesive layer 140 and the reflective layer 150.
In comparison with the light-emitting device 100, the reflective layer 150 of the light-emitting device 300 further covers a lateral surface 110 s of the substrate 110, and accordingly it can prevent or reduce the damage by the exterior environmental factors (such as air, water, gas, etc.) through the lateral surface 110 s of the substrate 110. Furthermore, due to the reflective layer 150 covering the lateral surface 110 s of the substrate 110, it can increase a length of a path P1 from the exterior environmental to the electrode (the first electrode 121 and/or the second electrode 122) of the light-emitting component 120 (in comparison with the path P1 of FIG. 1, the length of the path P1 of the present embodiment is longer), and accordingly it can reduce the probability of the light-emitting component 120 being damaged by the environmental factors for increasing the reliability and life of the light-emitting device 300.
In another embodiment, the top-viewed area of the wavelength conversion layer 130 of the light-emitting device 300 is substantially equal to the top-viewed area of the light-emitting component 120. Such structure is similar to the structure of the light-emitting device 200, and the similarities are not repeated.
FIG. 4 illustrates a cross sectional view of a light-emitting device 400 according to another embodiment of the invention. The light-emitting device 400 includes the substrate 110, a plurality of the light-emitting components 120, the wavelength conversion layer 130, the adhesive layer 140 and the reflective layer 150. The light-emitting components 120 are disposed on the substrate 110. The adhesive layer 140 covers at least a portion of the lateral surface 120 s of each light-emitting component 120.
In comparison with the aforementioned light-emitting device, a portion of the adhesive layer 140 of the light-emitting device 400 is further formed between adjacent two light-emitting components 120. For example, the adhesive layer 140 further includes a second lateral portion 143 located between two light-emitting components 120, and the second lateral portion 143 has a lower surface 143 s, wherein the lower surface 143 s is a convex surface or a concave surface. The reflective layer 150 is formed between adjacent two light-emitting components 120. For example, the reflective layer 150 further includes a second reflective portion 153, wherein the second reflective portion 153 is located between adjacent two light-emitting components 120. The second reflective portion 153 has a second reflective surface 153 s complying with the lower surface 143 s, and accordingly the second reflective surface 153 s is a concave surface. In another embodiment, the lower surface 143 s may be a concave surface, and the second reflective surface 153 s is a convex surface. The second reflective surface 153 s may reflect the light L1 emitted by the light-emitting component 120 to the wavelength conversion layer 130, and accordingly it can increase the luminous efficiency of the light-emitting device 400.
In another embodiment, the reflective layer 150 of the light-emitting device 400 may further cover the lateral surface 110 s of the substrate 110 s. Such structure is similar to the structure of the light-emitting device 300, and the similarities are not repeated.
In another embodiment, the top-viewed area of the wavelength conversion layer 130 of the light-emitting device 400 is substantially equal to the top-viewed area of the light-emitting component 120. Such structure is similar to the structure of the light-emitting device 200, and the similarities are not repeated.
FIGS. 5A to 5H illustrate manufacturing processes of the light-emitting device 100 of FIG. 1.
As illustrated in FIG. 5A, a wavelength conversion resin 130′ is formed on a carrier 10 by way of, for example, dispensing. The wavelength conversion resin 130′ contains a plurality of the phosphor particles 133. The polarity of the carrier 10 and the polarity of the wavelength conversion resin 130′ are different, and accordingly the wavelength conversion resin 130′ and the carrier 10 may be easily detached. In addition, although not illustrated, the carrier 10 may include a double-sided adhesive layer and a carrier plate, wherein the double-sided adhesive layer is adhered to the carrier plate for carrying the wavelength conversion resin 130′.
As illustrated in FIG. 5B, after the wavelength conversion resin 130′ is stood for a period such as 24 hours, most of the phosphor particles 133 precipitate on a bottom of the wavelength conversion resin 130′ to form the high-density phosphor layer 131, wherein the other of the phosphor particles 133 are distributed within the other portion of the wavelength conversion layer material 130′ to form the low-density phosphor layer 132. The high-density phosphor layer 131 and the low-density phosphor layer 132 form the wavelength conversion layer 130.
Then, the wavelength conversion layer 130 is cured. As a result, the positions of the phosphor particles 133 can be fixed, and accordingly it can prevent the density distribution of the phosphor particles 133 within the wavelength conversion layer 130 from being easily changed.
Then, the carrier 10 and the wavelength conversion layer 130 are separated to expose the high-density phosphor layer 131 of the wavelength conversion layer 130.
As illustrated in FIG. 5C, the substrate 110 and at least one light-emitting component 120 are provided, wherein the light-emitting component 120 is disposed on the substrate 110. In addition, the substrate 110 may be disposed on another carrier 10′, wherein the carrier 10′ has a structure similar to that of the carrier 10, and the similarities are not repeated.
Then, the high-density phosphor layer 131 of the wavelength conversion layer 130 is adhered to the light-emitting component 120 by the adhesive layer 140. The following description will be made with reference to the accompanying drawings.
As illustrated in FIG. 5D, the adhesive layer 140 is formed on the upper surface 120 u of the light-emitting component 120 by way of, for example, applying or dispensing.
As illustrated in FIG. 5E, the wavelength conversion layer 130 is disposed on the adhesive layer 140, such that the adhesive layer 140 adheres the light-emitting component 120 to the high-density phosphor layer 131 of the wavelength conversion layer 130. Since the wavelength conversion layer 130 extrudes the adhesive layer 140, the adhesive layer 140 flow toward two sides of the light-emitting component 120 to form the first lateral portion 141. Due to surface tension, the lateral surface 141 s of the first lateral portion 141 forms a concave surface. Depending on the amount of the adhesive layer 140 and/or the property of the adhesive layer 140, the lateral surface 141 s may form a convex surface. In addition, depending on the amount of the adhesive layer 140 and/or the property of the adhesive layer 140, the first lateral portion 141 may cover at least a portion of the lateral surface 120 s of the light-emitting component 120.
As illustrated in an enlargement view of FIG. 5E, a portion of the adhesive layer 140 which remains on between the wavelength conversion layer 130 and the light-emitting component 120 forms the heat resistance layer 142. The heat resistance layer 142 may reduce the heat of transmitting to the wavelength conversion layer 130 from the light-emitting component 120, and accordingly it can slow the degrading speed of the wavelength conversion layer 130.
As illustrated in FIG. 5F, at least one first singulation path W1 passing through the wavelength conversion layer 130 is formed to cut off the wavelength conversion layer 130. In the present embodiment, the first singulation path W1 does not pass through the first lateral portion 141 of the adhesive layer 140. In another embodiment, the first singulation path W1 may pass through a portion of the first lateral portion 141. The lateral surface 130 s of the wavelength conversion layer 130 is formed by the first singulation path W1, wherein the lateral surface 130 s may be a plane or a curved surface.
The cutting width for forming the first singulation path W1 may be substantially equal to the width of the first singulation path W1. Alternatively, after the first singulation path W1 is formed, the double-sided adhesive layer (not illustrated) disposed on the carrier 10′ may be stretched to increase an interval between adjacent two light-emitting components 120. Under such design, the first singulation path W1 may be formed using a thin blade.
As illustrated in FIG. 5G, the fluid reflective layer 150 is formed above the substrate 110 by way of, for example, compression molding, wherein the reflective layer 150 covers a portion of the lateral surface 120 s of the light-emitting component 120, the lateral surface 130 s of the wavelength conversion layer 130, the lateral surface 141 s of the first lateral portion 141 of the adhesive layer 140, the lateral surface of the third electrode 112 of the substrate 110, the lateral surface of the fourth electrode 113 of the substrate 110, the lateral surface of the first electrode 121 of the light-emitting component 120 and the lateral surface of the second electrode 122 of the light-emitting component 120.
In addition, the reflective layer 150 includes the first reflective portion 151 surrounding the entire lateral surface 120 s of the light-emitting component 120. The first reflective portion 151 has the first reflective surface 151 s. Due to the lateral surface 141 s of the adhesive layer 140 being a concave surface, the first reflective surface 151 s covering the lateral surface 141 s is a convex surface facing the wavelength conversion layer 130 and the light-emitting component 120. The convex first reflective surface 151 s can reflect the light L1 emitted from the lateral surface 120 s to the wavelength conversion layer 130, and accordingly it can increase the luminous efficiency of the light-emitting device 100.
Since the first singulation path W1 of FIG. 5F does not pass through the first lateral portion 141 of the adhesive layer 140, the first reflective surface 151 s of the reflective layer 150 can contact the lower surface 130 b of the wavelength conversion layer 130. As a result, the convex first reflective surface 151 s connects the lower surface 130 b of the wavelength conversion layer 130 to the lateral surface 120 s of the light-emitting component 120, and accordingly it can increase the contacting area of the light L1 emitted from the light-emitting component 120 and the convex surface (the first reflective surface 151 s).
Then, the reflective layer 150 is cured by way of heating.
As illustrated in FIG. 5H, at least one second singulation path W2 passing through the reflective layer 150 and the substrate 110 is formed to form the light-emitting device 100 of FIG. 1. The first reflective surface 151 s of the reflective layer 150 and the lateral surface 110 s of the substrate 110 are formed by the second singulation path W2, wherein the first reflective surface 151 s and the lateral surface 110 s are substantially aligned or flush with each other.
In another embodiment, the second singulation path W2 may pass through the wavelength conversion layer 130, the reflective layer 150 and the substrate 110, such that the wavelength conversion layer 130, the reflective layer 150 and the substrate 110 form the lateral surface 130 s, the lateral surface 150 s and lateral surface 110 s respectively, wherein the lateral surface 130 s, the lateral surface 150 s and lateral surface 110 s are substantially aligned or flush with each other.
In addition, the cutting width for forming the second singulation path W2 may be substantially equal to the width of the second singulation path W2. Alternatively, after the second singulation path W2 is formed, the double-sided adhesive layer (not illustrated) disposed on the carrier 10′ may be stretched to increase an interval between adjacent two light-emitting components 120. Under such design, the second singulation path W2 may be formed using a thin blade.
FIGS. 6A to 6C illustrate another manufacturing processes of the light-emitting device 100 of FIG. 1.
As illustrated in FIG. 6A, the adhesive layer 140 is formed on the high-density phosphor layer 131 of the wavelength conversion layer 130 by way of, for example, applying or dispensing.
As illustrated in FIG. 6B, the substrate 110 and the light-emitting component 120 of FIG. 5C are disposed on the adhesive layer 140, wherein the light-emitting component 120 contacts with the adhesive layer 140, such that the adhesive layer 140 adheres the light-emitting component 120 to the high-density phosphor layer 131 of the wavelength conversion layer 130.
Due to the light-emitting component 120 extruding the adhesive layer 140, the adhesive layer 140 flows toward two sides of the light-emitting component 120 to form the first lateral portion 141. Due to surface tension, the lateral surface 141 s of the first lateral portion 141 forms a concave surface. Depending on the amount of the adhesive layer 140 and/or the property of the adhesive layer 140, the first lateral portion 141 may cover at least a portion of the lateral surface 120 s of the light-emitting component 120. In addition, as illustrated in an enlargement view of FIG. 6B, a portion of the adhesive layer 140 which remains on between the wavelength conversion layer 130 and the light-emitting component 120 forms the heat resistance layer 142. The heat resistance layer 142 may reduce the heat of transmitting to the wavelength conversion layer 130 from the light-emitting component 120, and accordingly it can slow the degrading speed of the wavelength conversion layer 130.
As illustrated in FIG. 6C, the light-emitting components 120, the wavelength conversion layer 130 and the substrate 110 are inverted, such that the wavelength conversion layer 130 faces upwardly.
The following steps are similar the corresponding steps of FIGS. 5A to 5H, and the similarities are not repeated.
FIGS. 7A to 7C illustrate manufacturing processes of the light-emitting device 200 of FIG. 2.
Firstly, the structure of FIG. 5E is formed by using the processes of FIG. 5A to 5E, or the structure of FIG. 6C is formed by using the processes of FIG. 6A to 6C.
Then, as illustrated in FIG. 7A, at least one first singulation path W1 passing through the wavelength conversion layer 130 and the first lateral portion 141 which covers the lateral surface 120 s of the light-emitting component 120 is formed, by way of cutting, to cut off the wavelength conversion layer 130 and remove the first lateral portion 141. Since the first singulation path W1 cuts off the first lateral portion 141, such that the entire lateral surface 120 s of the light-emitting component 120 and the entire lateral surface 142 s of the heat resistance layer 142 are be formed and exposed.
As illustrated in FIG. 7B, the fluid reflective layer 150 is formed above the substrate 110 by way of, for example, compression molding, wherein the reflective layer 150 covers the entire lateral surface 120 s of the light-emitting component 120, the entire lateral surface 142 s of the heat resistance layer 142, the entire lateral surface 130 s of the wavelength conversion layer 130, the lateral surface of the third electrode 112 of the substrate 110, the lateral surface of the fourth electrode 113 of the substrate 110, the lateral surface of the first electrode 121 of the light-emitting component 120 and the lateral surface of the second electrode 122 of the light-emitting component 120.
Then, the reflective layer 150 is cured by way of heating.
As illustrated in FIG. 7C, at least one second singulation path W2 passing through the reflective layer 150 and the substrate 110 is formed, by way of cutting, to form the light-emitting device 200 of FIG. 2. The lateral surface 150 s of the reflective layer 150 and the lateral surface 110 s of the substrate 110 are formed by the second singulation path W2, wherein the lateral surface 150 s and the lateral surface 110 s are substantially aligned or flush with each other.
FIGS. 8A to 8C illustrate manufacturing processes of the light-emitting device 300 of FIG. 3.
Firstly, the structure of FIG. 5E is formed by using the processes of FIG. 5A to 5E, or the structure of FIG. 6C is formed by using the processes of FIG. 6A to 6C.
Then, as illustrated in FIG. 8A, at least one first singulation path W1 passing through the wavelength conversion layer 130 and the substrate 110 is formed, by way of cutting, to cut off the wavelength conversion layer 130 and the substrate 110. The lateral surface 130 s of the wavelength conversion layer 130 and the lateral surface 110 s of the substrate 110 are formed by the first singulation path W1, wherein the lateral surface 130 s and the lateral surface 110 s are substantially aligned or flush with each other.
As illustrated in FIG. 8B, the fluid reflective layer 150 is formed above the substrate 110 by way of, for example, dispensing, wherein the reflective layer 150 covers a portion of the lateral surface 120 s of the light-emitting component 120, the lateral surface 130 s of the wavelength conversion layer 130, the lateral surface 141 s of the first lateral portion 141 of the adhesive layer 140, the lateral surface 110 s of the substrate 110, the lateral surface of the third electrode 112 of the substrate 110, the lateral surface of the fourth electrode 113 of the substrate 110, the lateral surface of the first electrode 121 of the light-emitting component 120 and the lateral surface of the second electrode 122 of the light-emitting component 120.
Then, the reflective layer 150 is cured by way of heating.
As illustrated in FIG. 8C, at least one second singulation path W2 passing through the reflective layer 150 is formed to form the light-emitting device 300 of FIG. 3, wherein the lateral surface 150 s and the reflective layer 150 is formed by the second singulation path W2.
In another embodiment, the second singulation path W2 may pass through the wavelength conversion layer 130, the reflective layer 150 and the substrate 110, such that the wavelength conversion layer 130, the reflective layer 150 and the substrate 110 form the lateral surface 130 s, the lateral surface 150 s and lateral surface 110 s respectively, wherein the lateral surface 130 s, the lateral surface 150 s and lateral surface 110 s are substantially aligned or flush with each other.
FIGS. 9A to 9F illustrate manufacturing processes of the light-emitting device 400 of FIG. 4.
As illustrated in FIG. 9A, the substrate 110 and a plurality of the light-emitting components 120 are provided, wherein the light-emitting components 120 are disposed on the substrate 110.
As illustrated in FIG. 9A, the substrate 110 and the light-emitting components 120 are disposed on the carrier 10′.
As illustrated in FIG. 9B, the adhesive layer 140 is formed on the upper surface 120 u of the light-emitting component 120 by way of, for example, applying or dispensing.
As illustrated in FIG. 9C, the wavelength conversion layer 130 is disposed on the adhesive layer 140, such that the adhesive layer 140 adheres each light-emitting component 120 to the high-density phosphor layer 131 of the wavelength conversion layer 130. Since the wavelength conversion layer 130 extrudes the adhesive layer 140, the adhesive layer 140 flow toward two sides of the light-emitting component 120 to form the first lateral portion 141. The first lateral portion 141 has the lateral surface 141 s. Due to surface tension, the lateral surface 141 s is a concave surface. However, depending on the amount of the adhesive layer 140 and/or the property of the adhesive layer 140, the lateral surface 141 s may form a convex surface facing substrate 110. In addition, depending on the amount of the adhesive layer 140 and/or the property of the adhesive layer 140, the first lateral portion 141 may cover at least a portion of the lateral surface 120 s of the light-emitting component 120.
As illustrated in an enlargement view of FIG. 9C, a portion of the adhesive layer 140 which remains on between the wavelength conversion layer 130 and the light-emitting component 120 forms the heat resistance layer 142. The heat resistance layer 142 can increase the heat resistance between the light-emitting component 120 and the wavelength conversion layer 130, and accordingly it can slow the degrading speed of the wavelength conversion layer 130.
In addition, the adhesive layer 140 further includes the second lateral portion 143 which is formed between adjacent two light-emitting components 120. The second lateral portion 143 has the lower surface 143 s. Due to surface tension, the lower surface 143 s forms a concave surface facing the substrate 110. However, depending on the amount of the adhesive layer 140 and/or the property of the adhesive layer 140, the lower surface 143 s may be a concave surface facing the substrate 110.
As illustrated in FIG. 9D, at least one first singulation path W1 passing through the wavelength conversion layer 130 is formed to cut off the wavelength conversion layer 130. In the present embodiment, the first singulation path W1 does not pass through the first lateral portion 141 of the adhesive layer 140. In another embodiment, the first singulation path W1 may pass through a portion of the first lateral portion 141 or the entire first lateral portion 141.
As illustrated in FIG. 9E, the fluid reflective layer 150 is formed above the substrate 110 by way of, for example, dispensing, wherein the reflective layer 150 covers a portion of the lateral surface 120 s of the light-emitting component 120, the lateral surface 130 s of the wavelength conversion layer 130, the lateral surface 141 s of the first lateral portion 141 of the adhesive layer 140, the lower surface 143 s of the second lateral portion 143, the lateral surface of the third electrode 112 of the substrate 110, the lateral surface of the fourth electrode 113 of the substrate 110, the lateral surface of the first electrode 121 of the light-emitting component 120 and the lateral surface of the second electrode 122 of the light-emitting component 120 through the first singulation path W1.
In addition, the reflective layer 150 includes the first reflective portion 151 and the second reflective portion 153, wherein the first reflective portion 151 covers the first lateral portion 141, and the second reflective portion 153 covers the second lateral portion 143. The first reflective portion 151 has the first reflective surface 151 s complying with the lateral surface 141 s, and the first reflective surface 151 s is a convex surface due to the lateral surface 141 s being a concave surface. The second reflective portion 153 has the second reflective surface 153 s complying with the lower surface 143 s, and the second reflective surface 153 s is a concave surface due to the lateral surface 141 s being a convex surface.
Then, the reflective layer 150 is cured by way of heating.
As illustrated in FIG. 9F, at least one second singulation path W2 passing through the reflective layer 150 and the substrate 110 is formed to form the light-emitting device 400 of FIG. 4. The lateral surface 150 s of the reflective layer 150 and the lateral surface 110 s of the substrate 110 are formed by the second singulation path W2, wherein the lateral surface 150 s and the lateral surface 110 s are substantially aligned or flush with each other.
In another embodiment, the second singulation path W2 may pass through the wavelength conversion layer 130, the reflective layer 150 and the substrate 110, such that the wavelength conversion layer 130, the reflective layer 150 and the substrate 110 form the lateral surface 130 s, the lateral surface 150 s and lateral surface 110 s respectively, wherein the lateral surface 130 s, the lateral surface 150 s and lateral surface 110 s are substantially aligned or flush with each other.
In other embodiment, the reflective layer 150 of the light-emitting device 400 may cover the lateral surface 120 s of at least one light-emitting component 120, the lateral surface 142 s of the heat resistance layer 142 and the lateral surface 130 s of the wavelength conversion layer 130 by using processes of FIGS. 7A to 7C.
In other embodiment, the reflective layer 150 of the light-emitting device 400 may cover the lateral surface 110 s of the substrate 110 by using processes of FIGS. 8A to 8B.
It will be apparent to those skilled in the art that various modifications and variations can be made to the disclosed embodiments. It is intended that the specification and examples be considered as exemplary only, with a true scope of the disclosure being indicated by the following claims and their equivalents.

Claims

What is claimed is:

1. A light-emitting device, comprises:

a substrate;

a light-emitting component disposed on the substrate;

a wavelength conversion layer comprising a high-density phosphor layer and a low-density phosphor layer;

an adhesive layer formed between the light-emitting component and the high-density phosphor layer; and

a reflective layer formed above the substrate and covering a lateral surface of the light-emitting component, a lateral surface of the adhesive layer and a lateral surface of the wavelength conversion layer.

2. The light-emitting device according to claim 1, wherein the substrate has a lateral surface and the reflective layer further covers the lateral surface of the substrate.

3. The light-emitting device according to claim 1, wherein the light-emitting component comprises a first electrode and a second electrode, and the reflective layer further covers a lateral surface of the first electrode and a lateral surface of the second electrode.

4. The light-emitting device according to claim 1, wherein the adhesive layer comprises a first lateral portion, the first lateral portion covers a portion of the lateral surface of the light-emitting component, and the reflective layer covers another portion of the lateral surface of the light-emitting component.

5. The light-emitting device according to claim 1, wherein the reflective layer covers the entire lateral surface of the light-emitting component.

6. The light-emitting device according to claim 1, wherein the wavelength conversion layer covers the entire light-emitting component.

7. The light-emitting device according to claim 1, wherein an area of the wavelength conversion layer is equal to or larger than an area of the light-emitting component.

8. The light-emitting device according to claim 7, wherein a ratio of the area of the wavelength conversion layer and the area of the light-emitting component ranges between 1 and 1.35.

9. The light-emitting device according to claim 1, wherein the reflective layer comprises a first reflective portion, and the first reflective portion surrounds the light-emitting component.

10. The light-emitting device according to claim 9, wherein the first reflective portion has a first reflective surface facing the lateral surface of the light-emitting component.

11. The light-emitting device according to claim 10, wherein the first reflective surface is a convex surface facing the lateral surface of the light-emitting component.

12. The light-emitting device according to claim 11, wherein the convex surface connects a lower surface of the wavelength conversion layer to the lateral surface of the light-emitting component.

13. The light-emitting device according to claim 1, comprising:

a plurality of the light-emitting components disposed on the substrate;

wherein the adhesive layer comprises a second lateral portion formed between adjacent two of the light-emitting components.

14. The light-emitting device according to claim 1, comprising:

a plurality of the light-emitting components disposed on the substrate;

wherein the reflective layer comprises a second reflective portion formed between adjacent two of the light-emitting components.

15. The light-emitting device according to claim 14, wherein the second reflective portion has a second reflective surface, and the second reflective surface is a concave surface facing the wavelength conversion layer.

16. The light-emitting device according to claim 14, wherein the second reflective portion has a second reflective surface, and the second reflective surface is a convex surface facing the wavelength conversion layer.

17. The light-emitting device according to claim 1, wherein, comprising:

a plurality of the light-emitting components disposed on the substrate;

wherein each light-emitting component comprises a first electrode and a second electrode, and the reflective layer covers a lateral surface of the first electrode and a lateral surface of the second electrode.

18. The light-emitting device according to claim 1, wherein a ratio of a phosphor particle density of the high-density phosphor layer and a phosphor particle density of the low-density phosphor layer ranges between 1 and 10¹⁵.

19. The light-emitting device according to claim 1, wherein a ratio of a thickness of the low-density phosphor layer and a thickness of the high-density phosphor layer ranges between 1 and 1000.